Introduce chrome.shell.createWindow stub API for app_shell

extensions/renderer/extensions_renderer_client.h

Index: extensions/renderer/extensions_renderer_client.h
diff --git a/extensions/renderer/extensions_renderer_client.h b/extensions/renderer/extensions_renderer_client.h
index b8f5255b44531b206e0fa86ad4aa1b61bf3380d7..6b06b6c4d4eb9252b7a25393cdb028eb77e1de4c 100644
--- a/extensions/renderer/extensions_renderer_client.h
+++ b/extensions/renderer/extensions_renderer_client.h
@@ -5,8 +5,13 @@
 #ifndef EXTENSIONS_RENDERER_EXTENSIONS_RENDERER_CLIENT_H_
 #define EXTENSIONS_RENDERER_EXTENSIONS_RENDERER_CLIENT_H_
 
+class ResourceBundleSourceMap;
+
 namespace extensions {
 
+class ModuleSystem;
+class ScriptContext;
+
 // Interface to allow the extensions module to make render-process-specific
 // queries of the embedder. Should be Set() once in the render process.
 //
@@ -25,6 +30,13 @@ class ExtensionsRendererClient {
   // (third_party/WebKit/public/web/WebFrame.h) for additional context.
   virtual int GetLowestIsolatedWorldId() const = 0;
 
+  // Registers additional native C++ code handlers for JS API functions.
+  virtual void RegisterNativeHandlers(ModuleSystem* module_system,
+                                      ScriptContext* context) = 0;
+
+  // Registers additional JS source code resources for API implementations.
+  virtual void PopulateSourceMap(ResourceBundleSourceMap* source_map) = 0;
+
   // Returns the single instance of |this|.
   static ExtensionsRendererClient* Get();